MESON Chess Problem Database

Problem Display
PID: 263114 (5RB1/4K3/8/2BNNP2/1pbPkp1p/3p1RbP/3npp2/Q7 w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

7th Comm., SuperProblem, 2020

5RB1/4K3/8/2BNNP2/1pbPkp1p/3p1RbP/3npp2/Q7

#2

11 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.Sc3#
  • Tries
    • 1.Bh7?
      • threat
        • 2.Sf6#
      • 1...Kxd5
        • 2.Qa8#
      • 1...Bxd5
        • 2.f6#
      • 1...Sxf3!
    • 1.Qh1?
      • threat
        • 2.Re3#
        • 2.Rxf4#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Bxd5!
    • 1.Qa8?
      • threat
        • 2.Sc3#
      • 1...Bxd5
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Sxf3!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Sg5#
      • 1...Kxf3
        • 2.Qh1#
      • 1...Kxd5
        • 2.Qa8#
      • 1...Kxf5
        • 2.Bh7#
      • 1...Sxf3
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(f);N_GUARD::S(F)
  • Tries
    • Try
      • B(K);
      • Threat
        • S(F)
      • Vars
        • K(h);OGATEB,S_FLIGHT,XS(F)::QAB(A)
        • B(g);SBLOCK,XS(F)::B(K)+P(H)
      • Refutation
        • S(a);XR(B)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);OGATE,P_SPINS(a),XR(B)::QAB1(A),XS(a)
      • Refutation
        • B(g);XS(F)
    • Try
      • Q(A);
      • Threat
        • QAB(A)+S(F),DCHECK
      • Refutation
        • S(a);XR(B)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(h);OGATEB,S_FLIGHT,XR(B)::QAB(A)
      • K(h);OGATEB,S_FLIGHT,XS(F)::QAB(A)
      • K(h);OGATEB,P_SPINP(i),S_FLIGHT,XP(H)::B(K)
      • S(a);SBLOCK,XR(B)::S(G)
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