MESON Chess Problem Database

Problem Display
PID: 235637 (QB2b3/2p5/2P3p1/K1Pkp1p1/3pN1B1/b2P4/2N5/8 w - - 0 1)

Erokhin, Vladimir Alekseevich

Mat, 1988

QB2b3/2p5/2P3p1/K1Pkp1p1/3pN1B1/b2P4/2N5/8

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Sb4#
    • 1...Bb2
      • 2.Sb4#
    • 1...Bb4+
      • 2.Sxb4#
  • Tries
    • 1.Ba7?
      • threat
        • 2.Sf6#
      • 1...Bb4+
        • 2.Sxb4#
      • 1...Bxc5!
    • 1.Bxc7?
      • 1...Bb4+
        • 2.Sxb4#
      • 1...Bxc5
        • 2.Sf6#
      • 1...Bxc6
        • 2.Qg8#
      • 1...Bc1
        • 2.Sb4#
      • 1...Bb2
        • 2.Sb4#
      • 1...Bd7
        • 2.cxd7#
      • 1...Bf7!
  • Keys
    • 1.Kb5!
      • threat
        • 2.Sf6#
      • 1...Bxc6+
        • 2.Qxc6#
      • 1...Bxc5
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::S(A)
    • B(a);CHECK,N_GUARD::S(A),XB(a)
  • Tries
    • Try
      • B(I);
      • Threat
        • S(C)
      • Vars
        • B(a);CHECK,N_GUARD::S(A),XB(a)
      • Refutation
        • B(a);XP(F)
    • Try
      • B(I);XP(g)
      • Vars
        • B(a);CHECK,N_GUARD::S(A),XB(a)
        • B(a);SBLOCK,XP(F)::S(C)
        • B(h);OGATE,P_SPINB(h),SBLOCK,XP(G)::QAB(H)
        • B(a);N_GUARD::S(A)
        • B(h);OGATE::QAB(H)+P(G),XB(h)
      • Refutation
        • B(h);
  • Actual
    • K(E);P-FLIGHT,P_SPINP(G)
    • Threat
      • S(C)
    • Vars
      • B(h);CHECK,OGATE,P_SPINB(h),XP(G)::QAB1(H),XB(h)
      • B(a);OGATE,XP(F)::QAB(H)
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