MESON Chess Problem Database

Problem Display
PID: 276787 (2R5/1K2Q3/4NP1q/pB1P2p1/2P1b3/Brk1pp2/7p/N2R4 w - - 0 1)

Niemeijer, Meindert

Stella Polaris, 1971

2R5/1K2Q3/4NP1q/pB1P2p1/2P1b3/Brk1pp2/7p/N2R4

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf6
      • 2.Qxf6#
    • 1...Rxa3
      • 2.Qxa3#
    • 1...Rxb5+
      • 2.cxb5#
    • 1...Bxd5+
      • 2.cxd5#
  • Tries
    • 1.Sg7?
      • threat
        • 2.Qe5#
      • 1...Rxb5+
        • 2.cxb5#
      • 1...Bxd5+
        • 2.cxd5#
      • 1...Qxf6
        • 2.Qxf6#
      • 1...Rxa3
        • 2.Qxa3#
      • 1...Qxg7!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Qe5#
      • 1...Rxb5+
        • 2.Sxb5#
      • 1...Bxd5+
        • 2.Sxd5#
      • 1...Qxf6
        • 2.Qxf6#
      • 1...Rxa3
        • 2.Qxa3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(i);OGATE,XP(H)::QAB(J),XQ(i)
    • R(b);N_PINB(E),OGATE,XB(C)::QAR2(J),XR(b)
    • R(b);CHECK,OGATE,XB(E)::R(K)+P(D),XR(b)
    • B(f);CHECK,OGATE,XP(F)::R(K)+P(D),XB(f)
  • Tries
    • Try
      • S(G);
      • Threat
        • QAB(J)
      • Vars
        • R(b);CHECK,OGATE,XB(E)::R(K)+P(D),XR(b)
        • B(f);CHECK,OGATE,XP(F)::R(K)+P(D),XB(f)
        • Q(i);OGATE,XP(H)::QAB(J),XQ(i)
        • R(b);N_PINB(E),OGATE,XB(C)::QAR2(J),XR(b)
      • Refutation
        • Q(i);P_PINQ(J),XS(G)
  • Actual
    • S(G);
    • Threat
      • QAB(J)
    • Vars
      • R(b);CHECK,XB(E)::S(G),XR(b)
      • B(f);CHECK,XP(F)::S(G),XB(f)
      • Q(i);OGATE,XP(H)::QAB(J),XQ(i)
      • R(b);N_PINB(E),OGATE,XB(C)::QAR2(J),XR(b)
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Developed and maintained by Brian Stephenson.
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