MESON Chess Problem Database

Problem Display
PID: 277086 (4b1KB/1N3pRp/4NRPr/4k1pP/4PpB1/b2p1P2/7Q/8 w - - 0 1)

Egorov, Gennady Sergeevich

Shanshin, Valery Yurevich

Zhuravlev, Andrey Nikolaevich

Pat a Mat, 2009

4b1KB/1N3pRp/4NRPr/4k1pP/4PpB1/b2p1P2/7Q/8

#2

12 + 9

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf6
      • 2.Rxf7#
    • 1...Bb2
      • 2.Qxb2#
    • 1...Bd6
      • 2.Qb2#
    • 1...Be7
      • 2.Qb2#
    • 1...Bf8
      • 2.Qb2#
  • Tries
    • 1.Rxf4?
      • threat
        • 2.Rfxf7#
        • 2.Rgxf7#
      • 1...Rxh5
        • 2.Rgxf7#
      • 1...Rxg6
        • 2.Rxf7#
      • 1...gxf4
        • 2.Rxf7#
        • 2.Qxf4#
      • 1...fxe6
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rgf7#
        • 2.Rxh7#
      • 1...fxg6
        • 2.Rff7#
        • 2.Rf8#
        • 2.Rxg6#
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rgf7#
        • 2.Rxh7#
      • 1...hxg6
        • 2.Rfxf7#
      • 1...f5
        • 2.Re7#
      • 1...Bc1
        • 2.Rgxf7#
      • 1...Be7
        • 2.Rfxf7#
        • 2.Qb2#
      • 1...Bf8
        • 2.Rfxf7#
        • 2.Qb2#
      • 1...f6!
    • 1.Rgxf7?
      • threat
        • 2.Rxf4#
      • 1...Rxg6+
        • 2.Rxg6#
      • 1...Bxf7+
        • 2.Rxf7#
      • 1...Be7
        • 2.Qb2#
      • 1...Bf8
        • 2.Qb2#
      • 1...hxg6!
    • 1.Qf2?
      • threat
        • 2.Qd4#
      • 1...Kxf6
        • 2.Rxf7#
      • 1...fxe6
        • 2.Rxe6#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bc5!
  • Keys
    • 1.Rfxf7!
      • threat
        • 2.Rxh7#
      • 1...Bxf7+
        • 2.Rxf7#
      • 1...Rxg6
        • 2.Rxg6#
      • 1...hxg6
        • 2.Rh7#
      • 1...Be7
        • 2.Qb2#
      • 1...Bf8
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • K(d);N_SPINP(c),OGATEB,S_FLIGHT,XR(G)::B(L)+R(J),DCHECK,XP(g)
    • B(a);N_GUARD::QAB(A),XB(a)
    • B(a);N_GUARD::QAB(A)
  • Tries
    • Try
      • R(G);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XP(E)::B(L)+R(J),XP(g)
        • R(f);P_PINR(J),XP(H)::QAB(A)+R(G),XP(g)
        • P(h);XP(H)::QAB(A)+R(G),XP(g)
        • P(g);OGATE::B(L)+R(J)
        • B(a);::B(L)+R(J),XP(g)
      • Refutation
        • P(g);
    • Try
      • R(J);XP(g)
      • Threat
        • B(L)+R(G),XP(c)
      • Vars
        • R(f);CHECK,OGATE,XP(H)::B(L)+R(G),XR(f)
        • B(i);CHECK,OGATE,XR(J)::B(L)+R(G),XB(i)
        • B(a);N_GUARD::QAB(A)
      • Refutation
        • P(h);XP(H)
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • QAB1(A)
      • Vars
        • K(d);OGATEB,S_FLIGHT,XR(G)::B(L)+R(J),DCHECK,XP(g)
        • P(g);OGATE,XS(F)::R1(G),XP(g)
        • B(a);N_GUARD::QAB(A),XB(a)
      • Refutation
        • B(a);
  • Actual
    • R(G);XP(g)
    • Threat
      • B(L)+R(J),XP(h)
    • Vars
      • B(i);CHECK,OGATE,XR(G)::B(L)+R(J),XB(i)
      • R(f);OGATE,P_PINR(J),XP(H)::B(L)+R(J),XR(f)
      • P(h);XP(H)::B(L)+R(J)
      • B(a);N_GUARD::QAB(A)
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