MESON Chess Problem Database

Problem Display
PID: 233715 (3qQK2/1n1p1P2/2pkN2N/2R2Pp1/3B2r1/5B2/6bb/4R3 w - - 0 1)

Couture, William J

Chess Life, 1949

3qQK2/1n1p1P2/2pkN2N/2R2Pp1/3B2r1/5B2/6bb/4R3

#2

10 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.Qe7#
    • 1...Qb6
      • 2.Qe7#
    • 1...Qf6
      • 2.Qb8#
    • 1...Qc7
      • 2.Qe7#
    • 1...Qe7+
      • 2.Qxe7#
    • 1...Qb8
      • 2.Qxb8#
    • 1...Qxe8+
      • 2.fxe8S#
    • 1...Rg3
      • 2.Be5#
    • 1...Rf4
      • 2.Be5#
    • 1...Bg1
      • 2.Be5#
    • 1...Be5
      • 2.Bxe5#
    • 1...Sxc5
      • 2.Bxc5#
    • 1...dxe6
      • 2.Rxc6#
  • Tries
    • 1.Rd1?
      • threat
        • 2.Be5#
      • 1...Qe7+
        • 2.Qxe7#
      • 1...Qxe8+
        • 2.fxe8S#
      • 1...Rxd4
        • 2.Rxd4#
      • 1...dxe6
        • 2.Rxc6#
      • 1...Be5
        • 2.Bxe5#
      • 1...Sxc5!
    • 1.Qxd8?
      • threat
        • 2.Rxc6#
        • 2.Qc7#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Bxf3
        • 2.Qc7#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Sxc5
        • 2.Bxc5#
        • 2.Qc7#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Re4
        • 2.Qc7#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Sa5
        • 2.Qc7#
        • 2.Qe7#
        • 2.Qb8#
      • 1...Sxd8!
  • Keys
    • 1.f6!
      • threat
        • 2.Sf5#
      • 1...Qe7+
        • 2.Qxe7#
      • 1...Qxe8+
        • 2.fxe8S#
      • 1...Qxf6
        • 2.Qb8#
      • 1...dxe6
        • 2.Rxc6#
      • 1...Rf4
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 8
  • Sets
    • Q(i);N_PINQ(I)::QAB1(I)
    • Q(i);N_PINQ(I),P_PINP(H)::QAB(I)
    • Q(i);CHECK,N_PINQ(I)::QAB1(I),XQ(i)
    • Q(i);::QAB(I),XQ(i)
    • Q(i);CHECK,OGATE,XQ(I)::PXQ(i)=S
    • R(c);S_CUTB(b)::B(C)
    • B(b);N_GUARD::B(C)
    • B(b);N_GUARD::B(C),XB(b)
    • S(g);OGATE,XR(D)::B(C),XS(g)
    • P(h);N_GUARD,XS(F)::R1(D),XP(e)
  • Tries
    • Try
      • R(A);
      • Threat
        • R(A)+B(C),DCHECK
      • Vars
        • Q(i);CHECK,N_PINQ(I)::QAB1(I),XQ(i)
        • Q(i);CHECK,OGATE,XQ(I)::PXQ(i)=S
        • R(c);OGATE,P_SPINR(c),XB(C)::R(A),XR(c)
        • P(h);N_GUARD,XS(F)::R1(D),XP(e)
        • B(b);::R(A)+B(C),DCHECK,XB(b)
      • Refutation
        • S(g);XR(D)
    • Try
      • Q(I);N_SPINQ(I),P_PINP(h),XQ(i)
      • Threat
        • DUALS(4)
      • Refutation
        • S(g);N_SPINP(h),XQ(I)
  • Actual
    • P(E);
    • Threat
      • S(G)
    • Vars
      • Q(i);CHECK,N_PINQ(I)::QAB1(I),XQ(i)
      • Q(i);CHECK,OGATE,XQ(I)::PXQ(i)=S
      • Q(i);N_PINQ(I),P_PINP(H),XP(E)::QAB(I)
      • P(h);N_GUARD,XS(F)::R1(D),XP(e)
      • R(c);S_CUTB(b)::B(C)
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