MESON Chess Problem Database

Problem Display
PID: 236604 (8/qBb4p/3P2n1/p2RP3/Q1N1kpRp/3pN2r/2P2pPB/2n2K2 w - - 0 1)

Shanshin, Valery Yurevich

SuperProblem, 2019

8/qBb4p/3P2n1/p2RP3/Q1N1kpRp/3pN2r/2P2pPB/2n2K2

#2

12 + 12

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.cxd3#
    • 1...Se2
      • 2.cxd3#
    • 1...Sb3
      • 2.cxd3#
    • 1...Sxe5
      • 2.Rxf4#
    • 1...Se7
      • 2.Rxf4#
    • 1...Sf8
      • 2.Rxf4#
    • 1...Sh8
      • 2.Rxf4#
  • Tries
    • 1.Kxf2?
      • threat
        • 2.Sd2#
        • 2.Sb6#
      • 1...Qxe3+
        • 2.Sxe3#
      • 1...Rf3+
        • 2.gxf3#
      • 1...Bxd6
        • 2.Sd2#
        • 2.Sxd6#
      • 1...Sxe5
        • 2.Sd2#
        • 2.Rxf4#
      • 1...Qd4
        • 2.Sd2#
      • 1...Qc5
        • 2.Sd2#
      • 1...Qb6
        • 2.Sd2#
        • 2.Sxb6#
      • 1...Qa6
        • 2.Sd2#
      • 1...Bb6
        • 2.Sd2#
        • 2.Sxb6#
      • 1...Sa2
        • 2.Sd2#
        • 2.cxd3#
      • 1...Se2
        • 2.Sd2#
        • 2.cxd3#
      • 1...Sb3
        • 2.Sd2#
        • 2.cxd3#
      • 1...d2
        • 2.Sxd2#
        • 2.Sb6#
      • 1...Rxe3!
    • 1.Sb2+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Kxe3!
    • 1.Sa3+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Kxe3!
    • 1.Sxa5+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Kxe3!
    • 1.Bc8?
      • threat
        • 2.Bf5#
      • 1...Rxe3
        • 2.Sb6#
      • 1...Se7
        • 2.Rxf4#
      • 1...Qxe3!
    • 1.Rxa5+?
      • 1...Kd4
        • 2.Qa1#
      • 1...Qxb7!
    • 1.Rb5+?
      • 1...Kd4
        • 2.Qa1#
      • 1...Qxb7!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qf5#
      • 1...Qxe3
        • 2.Rxd3#
      • 1...Rxe3
        • 2.Sd2#
      • 1...Se7
        • 2.Rxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • S(a);N_GUARD::P(B),XP(c)
    • S(i);N_GUARD,XP(J)::R1(H),XP(f)
    • S(i);N_GUARD::R1(H),XP(f)
  • Tries
    • Try
      • K(A);P-FLIGHT,P_SPINS(E),XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);CHECK,XS(E)::QAR(F)+S(G),XQ(j)
        • R(d);CHECK,OGATE::P(C),XR(d)
        • Q(j);::S(G)
        • Q(j);::QAR(F)+S(G),DCHECK
        • Q(j);N_PINS(E)::QAR(F)+S(G),DCHECK
      • Refutation
        • R(d);XS(E)
    • Try
      • S(G);CHECK
      • Vars
        • Q(j);N_GUARD,P_SPINQ(j)::QAR1(F),XQ(j)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT,XS(E)
    • Try
      • S(G);CHECK
      • Vars
        • Q(j);N_GUARD,P_SPINQ(j)::QAR1(F),XQ(j)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT,XS(E)
    • Try
      • S(G);CHECK,XP(h)
      • Vars
        • Q(j);N_GUARD,P_SPINQ(j)::QAR1(F),XQ(j)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT,XS(E)
    • Try
      • B(L);
      • Threat
        • B(L)
      • Vars
        • R(d);SBLOCK,XS(E)::QAR(F)+S(G)
        • S(i);N_GUARD::R1(H),XP(f)
      • Refutation
        • Q(j);XS(E)
    • Try
      • R(I);CHECK,XP(h)
      • Vars
        • K(e);P-FLIGHT::QAB(F)
      • Refutation
        • Q(j);XB(L)
    • Try
      • R(I);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB(F)
      • Refutation
        • Q(j);XB(L)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • Q(j);N_GUARD,XS(E)::B(L)+R(I),XP(c)
      • R(d);SBLOCK,XS(E)::S(G)
      • S(i);N_GUARD::R1(H),XP(f)
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