diff --git a/src/GF/GF2_ppBSE2_dynamical_kernel_B.f90 b/src/GF/GF2_ppBSE2_dynamical_kernel_B.f90
new file mode 100644
index 0000000..83c3f5a
--- /dev/null
+++ b/src/GF/GF2_ppBSE2_dynamical_kernel_B.f90
@@ -0,0 +1,136 @@
+subroutine GF2_ppBSE2_dynamic_kernel_B(ispin,eta,nBas,nC,nO,nV,nR,nOO,nVV,lambda,ERI,eGF,KB_dyn)
+
+! Compute the resonant part of the dynamic BSE2 matrix
+
+  implicit none
+  include 'parameters.h'
+
+! Input variables
+
+  integer,intent(in)            :: ispin
+  integer,intent(in)            :: nBas
+  integer,intent(in)            :: nC
+  integer,intent(in)            :: nO
+  integer,intent(in)            :: nV
+  integer,intent(in)            :: nR
+  integer,intent(in)            :: nVV
+  double precision,intent(in)   :: eta
+  double precision,intent(in)   :: lambda
+  double precision,intent(in)   :: ERI(nBas,nBas,nBas,nBas)
+  double precision,intent(in)   :: eGF(nBas)
+  
+! Local variables
+
+  double precision              :: dem,num
+  integer                       :: i,j,k,a,b,c
+  integer                       :: ab,ij
+
+! Output variables
+
+  double precision,intent(out)  :: KB_dyn(nVV,nOO)
+
+! Initialization
+
+  KB_dyn(:,:) = 0d0
+
+! Second-order correlation kernel for the block B of the singlet manifold
+
+  if(ispin == 1) then
+
+    ab = 0
+    do a=nO+1,nBas-nR
+      do b=a,nBas-nR
+        ab = ab + 1
+
+        ij = 0
+        do i=nC+1,nO
+          do j=i,nO
+            ij = ij + 1
+  
+            do k=nC+1,nO
+              do c=nO+1,nBas-nR
+     
+                dem = eGF(j) + eGF(k) - eGF(c) - eGF(b)
+                num = 2d0*ERI(a,k,i,c)*ERI(b,c,j,k) -     ERI(a,k,i,c)*ERI(b,c,k,j) & 
+                    -     ERI(a,k,c,i)*ERI(b,c,j,k) + 2d0*ERI(a,k,c,i)*ERI(b,c,k,j)
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) + 0.5d0*num*dem/(dem**2 + eta**2)
+            
+                dem = eGF(j) + eGF(k) - eGF(c) - eGF(a)
+                num = 2d0*ERI(b,k,i,c)*ERI(a,c,j,k) -     ERI(b,k,i,c)*ERI(a,c,k,j) & 
+                    -     ERI(b,k,c,i)*ERI(a,c,j,k) + 2d0*ERI(b,k,c,i)*ERI(a,c,k,j)
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) - 0.5d0*num*dem/(dem**2 + eta**2)
+            
+                dem = eGF(i) + eGF(k) - eGF(c) - eGF(a)
+                num = 2d0*ERI(a,c,i,k)*ERI(b,k,j,c) -     ERI(a,c,i,k)*ERI(b,k,c,j) & 
+                    -     ERI(a,c,k,i)*ERI(b,k,j,c) + 2d0*ERI(a,c,k,i)*ERI(b,k,c,j)
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) + 0.5d0*num*dem/(dem**2 + eta**2)
+            
+                dem = eGF(i) + eGF(k) - eGF(c) - eGF(b)
+                num = 2d0*ERI(b,c,i,k)*ERI(a,k,j,c) -     ERI(b,c,i,k)*ERI(a,k,c,j) & 
+                    -     ERI(b,c,k,i)*ERI(a,k,j,c) + 2d0*ERI(b,c,k,i)*ERI(a,k,c,j)
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) - 0.5d0*num*dem/(dem**2 + eta**2)
+            
+              end do
+            end do
+
+          end do
+        end do
+
+      end do
+    end do
+
+  end if
+
+! Second-order correlation kernel for the block B of the triplet manifold
+
+  if(ispin == 2) then
+
+    ab = 0
+    do a=nO+1,nBas-nR
+      do b=a+1,nBas-nR
+        ab = ab + 1
+
+        ij = 0
+        do i=nC+1,nO
+          do j=i+1,nO
+            ij = ij + 1
+  
+            do k=nC+1,nO
+              do c=nO+1,nBas-nR
+     
+                dem = eGF(j) + eGF(k) - eGF(c) - eGF(b)
+                num = 2d0*ERI(a,k,i,c)*ERI(b,c,j,k) - ERI(a,k,i,c)*ERI(b,c,k,j) - ERI(a,k,c,i)*ERI(b,c,j,k) 
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) + 0.5d0*num*dem/(dem**2 + eta**2)
+            
+                dem = eGF(j) + eGF(k) - eGF(c) - eGF(a)
+                num = 2d0*ERI(b,k,i,c)*ERI(a,c,j,k) - ERI(b,k,i,c)*ERI(a,c,k,j) - ERI(b,k,c,i)*ERI(a,c,j,k) 
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) - 0.5d0*num*dem/(dem**2 + eta**2)
+            
+                dem = eGF(i) + eGF(k) - eGF(c) - eGF(a)
+                num = 2d0*ERI(a,c,i,k)*ERI(b,k,j,c) - ERI(a,c,i,k)*ERI(b,k,c,j) - ERI(a,c,k,i)*ERI(b,k,j,c) 
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) + 0.5d0*num*dem/(dem**2 + eta**2)
+            
+                dem = eGF(i) + eGF(k) - eGF(c) - eGF(b)
+                num = 2d0*ERI(b,c,i,k)*ERI(a,k,j,c) - ERI(b,c,i,k)*ERI(a,k,c,j) - ERI(b,c,k,i)*ERI(a,k,j,c) 
+
+                KB_dyn(ia,jb) = KB_dyn(ia,jb) - 0.5d0*num*dem/(dem**2 + eta**2)
+            
+              end do
+            end do
+
+          end do
+        end do
+
+      end do
+    end do
+
+  end if
+
+end subroutine