MESON Chess Problem Database

Problem Display
PID: 55951 (B4K2/8/4p3/pp5R/RP1k2p1/1PbN4/1P1r1P2/2QnN1B1 w - - 0 1)

Retter, Yosef

3rd Prize, Halkidiki 5-day Ty., 2004

B4K2/8/4p3/pp5R/RP1k2p1/1PbN4/1P1r1P2/2QnN1B1

#2

12 + 8

102 Probleemblad 2004
56 The Problemist 2004
721 Variantim 2004
136 Problem Observer 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb2
      • 2.Qf4#
    • 1...Rc2
      • 2.Qf4#
    • 1...Rxf2+
      • 2.Qf4#
    • 1...Rxd3
      • 2.Sc2#
      • 2.Qf4#
    • 1...Bxb2
      • 2.Qc5#
    • 1...Bxb4+
      • 2.Qc5#
    • 1...Se3
      • 2.Qxc3#
      • 2.bxc3#
      • 2.fxe3#
    • 1...g3
      • 2.Rh4#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Sxe6#
      • 1...Rxf2+
        • 2.Qf4#
      • 1...Bxb4
        • 2.Qxd2#
      • 1...Sxf2
        • 2.Qxc3#
      • 1...e5
        • 2.Se6#
      • 1...Re2!
    • 1.Re5?
      • threat
        • 2.Re4#
      • 1...Rxf2+
        • 2.Qf4#
      • 1...Bxb4+
        • 2.Qc5#
      • 1...Re2!
    • 1.Rh7?
      • threat
        • 2.Rd7#
      • 1...Rxf2+
        • 2.Qf4#
      • 1...Bxb4+
        • 2.Qc5#
      • 1...Rxd3
        • 2.Qf4#
      • 1...Se3
        • 2.Qxc3#
        • 2.bxc3#
        • 2.fxe3#
      • 1...Sxf2!
    • 1.Qxd2?
      • threat
        • 2.Sc2#
        • 2.Qf4#
      • 1...Bxb4+
        • 2.Sxb4#
        • 2.Sc5#
      • 1...Bxb2
        • 2.Sc2#
        • 2.Sc1#
        • 2.Sxb2#
        • 2.Sf4#
        • 2.Sc5#
        • 2.Se5#
      • 1...Se3
        • 2.Qxc3#
        • 2.Qxe3#
        • 2.bxc3#
        • 2.fxe3#
      • 1...e5
        • 2.Sc2#
      • 1...Bxd2!
    • 1.f3+?
      • 1...Rf2
        • 2.Qf4#
      • 1...Se3
        • 2.Qxc3#
        • 2.bxc3#
      • 1...Sf2!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sxe6#
      • 1...Bxb4+
        • 2.Qc5#
      • 1...Rxf2
        • 2.Sc2#
      • 1...Sxf2
        • 2.Qxc3#
      • 1...Re2
        • 2.Sxe2#
      • 1...e5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(b);OGATE,XP(D)::QAR2(A)
    • R(b);OGATE::QAR2(A)
    • R(b);CHECK,OGATE,P_SPINR(b),XP(E)::QAR2(A)
    • B(c);OGATE,XP(D)::QAB1(A)
    • B(c);CHECK,OGATE,P_SPINB(c),XP(I)::QAB1(A)
    • P(e);OGATEB::R(J)
  • Tries
    • Try
      • S(G);
      • Threat
        • S(G),XP(h)
      • Vars
        • R(b);CHECK,OGATE,P_SPINR(b),XP(E)::QAR2(A)
        • B(c);N_GUARD,P_PINS(G),P_SPINB(c),XP(I)::QAR2(A),XR(b)
        • S(a);N_GUARD,P_SPINS(a),XP(E)::QAB1(A),XB(c)
        • P(h);::S(G)
      • Refutation
        • R(b);
    • Try
      • R(J);
      • Threat
        • R1(J)
      • Vars
        • R(b);CHECK,OGATE,P_SPINR(b),XP(E)::QAR2(A)
        • B(c);CHECK,OGATE,P_SPINB(c),XP(I)::QAB1(A)
      • Refutation
        • R(b);
    • Try
      • R(J);
      • Threat
        • R(J)
      • Vars
        • R(b);CHECK,OGATE,P_SPINR(b),XP(E)::QAR2(A)
        • B(c);CHECK,OGATE,P_SPINB(c),XP(I)::QAB1(A)
        • R(b);OGATE,XS(G)::QAR2(A)
      • Refutation
        • S(a);P_SPINS(a),XP(E)
    • Try
      • Q(A);XR(b)
      • Threat
        • DUALS(2)
      • Vars
        • P(h);::S(B)
      • Refutation
        • B(c);XQ(A)
    • Try
      • P(E);CHECK
      • Vars
        • R(b);OGATE,P_PINP(E),P_SPINR(b)::QAR2(A)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • S(G);
    • Threat
      • S(G),XP(h)
    • Vars
      • B(c);CHECK,OGATE,P_SPINB(c),XP(I)::QAB1(A)
      • R(b);N_GUARD,P_PINS(G),P_SPINR(b),XP(E)::S(B)
      • S(a);N_GUARD,P_SPINS(a),XP(E)::QAB1(A),XB(c)
      • R(b);N_GUARD::S(G),XR(b)
      • P(h);::S(G)
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