MESON Chess Problem Database

Problem Display
PID: 232507 (4n3/1Qr5/2PqP3/6R1/1nRpk2N/4P1P1/2p1K3/BB6 w - - 0 1)

Groth, Reinhard

Freie Presse, 1986

4n3/1Qr5/2PqP3/6R1/1nRpk2N/4P1P1/2p1K3/BB6

#2

11 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg3
      • 2.Rxd4#
    • 1...Qf4
      • 2.Rxd4#
    • 1...Qe7
      • 2.Rxd4#
    • 1...Qf8
      • 2.Rxd4#
    • 1...Qxc6
      • 2.Rxd4#
    • 1...Qxe6
      • 2.Rxd4#
    • 1...Rxc6
      • 2.Qh7#
    • 1...Rh7
      • 2.Qxh7#
    • 1...Rc8
      • 2.Qh7#
    • 1...Sa2
      • 2.Bxc2#
    • 1...Sd5
      • 2.Bxc2#
      • 2.Rxd4#
    • 1...Sa6
      • 2.Bxc2#
    • 1...Sxc6
      • 2.Bxc2#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Sd2#
      • 1...Qe5
        • 2.Rxe5#
      • 1...cxb1S!
    • 1.Bxc2+?
      • 1...Sd3
        • 2.Bxd3#
      • 1...Sxc2!
    • 1.Qxb4?
      • threat
        • 2.Bxc2#
      • 1...cxb1Q
        • 2.Qxb1#
      • 1...cxb1S
        • 2.Qxb1#
      • 1...cxb1B
        • 2.Qxb1#
      • 1...cxb1R
        • 2.Qxb1#
      • 1...Qe5!
  • Keys
    • 1.exd4!
      • threat
        • 2.d5#
      • 1...Qxd4
        • 2.Rxd4#
      • 1...Qxc6
        • 2.Re5#
      • 1...Rxc6
        • 2.Qh7#
      • 1...Sxc6
        • 2.Bxc2#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Qc5
        • 2.dxc5#
      • 1...Qd5
        • 2.Rg4#
      • 1...Sd5
        • 2.Bxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 9
  • Sets
    • Q(e);N_GUARD,XP(E)::R1(F),XP(c)
    • Q(e);N_GUARD::R1(F),XP(c)
    • Q(e);N_GUARD,P_SPINQ(e),XP(I)::R1(F),XP(c)
    • Q(e);N_GUARD,XP(J)::R1(F),XP(c)
    • R(f);OGATE,P_SPINR(f),XP(I)::QAB(K)
    • R(f);OGATE::QAB(K),XR(f)
    • R(f);OGATE::QAB(K)
    • S(b);N_GUARD::B(B),XP(a)
    • S(b);N_GUARD,P_SPINS(b),XP(I)::B(B),XP(a)
  • Tries
    • Try
      • S(G);
      • Threat
        • S(G)
      • Vars
        • Q(e);N_GUARD::R1(H),XQ(e)
      • Refutation
        • P(a);N_SPINP(a),P_SPINP(c),XB(B)
    • Try
      • B(B);CHECK,P_PINP(c),XP(a)
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::B(B),XS(b)
      • Refutation
        • S(b);XB(B)
    • Try
      • Q(K);XS(b)
      • Threat
        • B(B),XP(a)
      • Vars
        • P(a);N_SPINP(a),OGATE,P_SPINP(c),XB(B)::QAB(K),XQ(a)
        • P(a);N_SPINP(a),OGATE,P_SPINP(c),XB(B)::QAB(K),XS(a)
        • P(a);N_SPINP(a),OGATE,P_SPINP(c),XB(B)::QAB(K),XB(a)
        • P(a);N_SPINP(a),OGATE,P_SPINP(c),XB(B)::QAB(K),XR(a)
      • Refutation
        • Q(e);
  • Actual
    • P(D);XP(c)
    • Threat
      • R(F)+P(D)
    • Vars
      • Q(e);OGATE,P_SPINQ(e),XP(D)::R1(F),XQ(e)
      • Q(e);N_GUARD,P_SPINQ(e),XP(I)::R1(H)
      • R(f);OGATE,P_SPINR(f),XP(I)::QAB(K)
      • S(b);N_GUARD,P_SPINS(b),XP(I)::B(B),XP(a)
      • Q(e);N_GUARD::R1(H),XQ(e)
      • Q(e);OGATE::R(F)+P(D),XQ(e)
      • Q(e);N_GUARD,SBLOCK::R(H)
      • S(b);N_GUARD::B(B),XP(a)
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