MESON Chess Problem Database

Problem Display
PID: 268795 (2RK4/RN1p4/3P4/1p6/PkP5/p3QN2/Pr1n4/1n2B3 w - - 0 1)

Sovik, Stefan

3rd Prize, Pravda (Bratislava), 2016-2017

(First published on Thu Oct 26 2017)

2RK4/RN1p4/3P4/1p6/PkP5/p3QN2/Pr1n4/1n2B3

#2

11 + 7

6490 yacpdb 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Qb3#
    • 1...Rb3
      • 2.Qxb3#
    • 1...Sc3
      • 2.Qc5#
  • Tries
    • 1.Sa5?
      • 1...Kxa4
        • 2.Sc6#
      • 1...Rxa2
        • 2.Qb3#
      • 1...bxa4
        • 2.Rb8#
      • 1...bxc4
        • 2.Rxc4#
      • 1...Rc2
        • 2.Qb3#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Sc3!
    • 1.Bxd2+?
      • 1...Rxd2
        • 2.Qb3#
      • 1...Sc3
        • 2.Bxc3#
        • 2.Qc5#
        • 2.Qxc3#
      • 1...Sxd2!
    • 1.Rb8?
      • 1...Kxc4
        • 2.Qd4#
      • 1...bxa4
        • 2.Sa5#
      • 1...bxc4
        • 2.Sc5#
      • 1...Rc2
        • 2.Qb3#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Sc3
        • 2.Qc5#
      • 1...Rxa2!
    • 1.axb5?
      • 1...Rc2
        • 2.Qb3#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Sc3
        • 2.Qc5#
      • 1...Rxa2!
    • 1.cxb5?
      • threat
        • 2.Qd4#
        • 2.Qf4#
        • 2.Qc5#
        • 2.Qe4#
      • 1...Rc2
        • 2.Qb3#
      • 1...Sc3
        • 2.Qc5#
        • 2.Qxc3#
      • 1...Rxa2!
  • Keys
    • 1.Sc5!
      • 1...Kxc4
        • 2.Qd4#
      • 1...Rxa2
        • 2.Qb3#
      • 1...bxa4
        • 2.Rxa4#
      • 1...bxc4
        • 2.Rb8#
      • 1...Rc2
        • 2.Qb3#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Sc3
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::QAR1(C)
    • R(b);N_GUARD::QAR1(C),XR(b)
    • S(a);N_SPINS(c),SBLOCK::QAB1(C)
  • Tries
    • Try
      • S(I);
      • Vars
        • K(e);N_GUARD,N_SPINS(c),P-FLIGHT,S_CUTP(g),XP(E)::R(H)+S(I)
        • R(b);N_GUARD,XP(B)::QAR1(C)
        • P(f);OGATEB,SBLOCK,XP(E)::R(J)
        • P(f);OGATE,XP(F)::R1(J),XP(f)
        • R(b);N_GUARD::QAR1(C)
        • R(b);N_GUARD::QAR1(C),XR(b)
      • Refutation
        • S(a);N_SPINS(c)
    • Try
      • B(A);CHECK,XS(c)
      • Vars
        • R(b);XB(A)::QAR1(C)
      • Refutation
        • S(a);XB(A)
    • Try
      • R(J);
      • Vars
        • K(e);N_SPINS(c),OGATEB,P-FLIGHT,XP(F)::QAR1(C)
        • P(f);SBLOCK,XP(E)::R(J)+S(I)
        • P(f);SBLOCK,XP(F)::R(J)+S(I)
        • R(b);N_GUARD::QAR1(C)
        • R(b);N_GUARD::QAR1(C),XR(b)
        • S(a);N_SPINS(c),SBLOCK::QAB1(C)
      • Refutation
        • R(b);XP(B)
    • Try
      • P(E);XP(f)
      • Vars
        • R(b);N_GUARD::QAR1(C)
        • R(b);N_GUARD::QAR1(C),XR(b)
        • S(a);N_SPINS(c),SBLOCK::QAB1(C)
      • Refutation
        • R(b);XP(B)
    • Try
      • P(F);XP(f)
      • Threat
        • DUALS(4)
      • Vars
        • R(b);N_GUARD::QAR1(C)
      • Refutation
        • R(b);XP(B)
  • Actual
    • S(I);
    • Vars
      • K(e);N_SPINS(c),OGATEB,P-FLIGHT,XP(F)::QAR1(C)
      • R(b);N_GUARD,XP(B)::QAR1(C)
      • P(f);OGATE,XP(E)::R1(H),XP(f)
      • P(f);OGATEB,SBLOCK,XP(F)::R(J)
      • R(b);N_GUARD::QAR1(C)
      • R(b);N_GUARD::QAR1(C),XR(b)
      • S(a);N_SPINS(c),SBLOCK::S(I)
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