MESON Chess Problem Database

Problem Display
PID: 158530 (1K3b2/BQP1Np2/3p2P1/3P4/3Pk1P1/2r2bP1/2P5/1B1n1N2 w - - 0 1)

Rosner, Eugene David

4th Prize, The Problemist, 2015/II

1K3b2/BQP1Np2/3p2P1/3P4/3Pk1P1/2r2bP1/2P5/1B1n1N2

#2

13 + 7

145 StrateGems 2015
145 StrateGems 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Bxc2#
    • 1...Ra3
      • 2.c3#
    • 1...Rb3
      • 2.cxb3#
    • 1...Rd3
      • 2.cxd3#
    • 1...Re3
      • 2.Sd2#
    • 1...Rc4
      • 2.c3#
    • 1...Rc5
      • 2.c3#
    • 1...Rc6
      • 2.c3#
      • 2.c4#
    • 1...Rxc7
      • 2.c3#
      • 2.c4#
    • 1...Se3
      • 2.Sd2#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Sd2#
      • 1...Rxc2
        • 2.Bxc2#
      • 1...Rc6
        • 2.c4#
      • 1...Rd3
        • 2.cxd3#
      • 1...Bh6
        • 2.Sxd6#
      • 1...Bxg4!
    • 1.c8Q?
      • threat
        • 2.Qf5#
      • 1...Bxg4
        • 2.Qxg4#
      • 1...fxg6
        • 2.Qe6#
      • 1...Rc5
        • 2.c3#
      • 1...Se3
        • 2.Sd2#
      • 1...f5
        • 2.Qxf5#
        • 2.Qe6#
      • 1...Rxc8+!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qf5#
      • 1...Rb3+
        • 2.cxb3#
      • 1...Bxg4
        • 2.Qxg4#
      • 1...fxg6
        • 2.Qe6#
      • 1...Rc5
        • 2.c3#
      • 1...Se3
        • 2.Sd2#
      • 1...f5
        • 2.Qxf5#
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(b);OGATE,P_SPINR(b),XP(C)::B(A),XR(b)
    • R(b);OGATE::B(A)+P(C)
    • R(b);OGATE,P_PINQ(J)::B(A)+P(C),XR(b)
    • R(b);OGATE::P(C),XR(b)
    • R(b);SBLOCK::S(B)
    • S(a);SBLOCK::S(B)
  • Tries
    • Try
      • S(L);
      • Threat
        • S(B)
      • Vars
        • R(b);OGATE,P_SPINR(b),XP(C)::B(A),XR(b)
        • R(b);OGATE::B(A)+P(C)
        • R(b);OGATE::P(C),XR(b)
        • B(g);N_GUARD::S(L),XP(e)
      • Refutation
        • B(c);XP(F)
    • Try
      • P(K);
      • Threat
        • QAB1(K)
      • Vars
        • B(c);OGATE,XP(F)::QAR2(K),XB(c)
        • P(f);N_GUARD,XP(H)::QAR2(K)
        • R(b);OGATE::B(A)+P(C)
        • S(a);SBLOCK::S(B)
      • Refutation
        • R(b);CHECK,XQ(K)
  • Actual
    • Q(J);
    • Threat
      • QAB1(J)
    • Vars
      • R(b);CHECK,OGATE::B(A)+P(C),XR(b)
      • B(c);OGATE,XP(F)::QAR2(J),XB(c)
      • P(f);N_GUARD,XP(H)::QAR2(J)
      • R(b);OGATE::B(A)+P(C)
      • S(a);SBLOCK::S(B)
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